Marine Weather and Tides
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.
|Sunrise 6:41AM||Sunset 8:20PM||Thursday July 29, 2021 8:26 PM EDT (00:26 UTC)||Moonrise 11:09PM||Moonset 11:04AM||Illumination 69%|
7 Day Forecast for Marine Location Near St. Augustine Beach, FLHourly EDIT Help
Area Discussion for - Jacksonville, FL  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS62 KJAX 292335 AFDJAX
Area Forecast Discussion National Weather Service Jacksonville FL 735 PM EDT Thu Jul 29 2021
AVIATION. [Through 00Z Saturday]
The rest of tonight will be dry with winds becoming calm and southwesterly at all TAF sites. Radiational cooling overnight will allow patchy fog to form late tonight into early Friday morning, MVFR fog included in TAFs for VQQ and GNV. Low stratus will also be possible, indicated lowering clouds after 08Z, but kept CIGs VFR for now. Fog and low stratus will lift shortly after sunrise, VFR conditions expected to continue through tomorrow. Low chance for thunderstorms in the afternoon at GNV, but left out due to low confidence.
PREV DISCUSSION [500 PM EDT].
NEAR TERM [Through Tonight].
Mid level ridging extends from the central and southern plains east into GA while a COL region rests overhead between the ridge and a departing mid/upper level trough off the east coast moving into the western Atlantic waters. At the surface a trough was draped across NE FL while weak high pressure was over the gulf of Mexico. Drier air aloft with lower PWATs in the 1.4-1.7 inch range was north of the trough over SE GA while a very moist airmass remained over NE FL with PWATs around 2.0 inches. Light southwest flow was pushing the Gulf coast seabreeze inland towards Highway 301 while the Atlantic seabreeze was near the I-95 corridor with scattered to numerous storms developing along the seabreezes.
Additional storms will continue to form through the afternoon as the Gulf seabreeze collides with a more pinned Atlantic seabreeze. Given the warm temperatures in the mid levels around -5 degrees Celsius plus the weak steering flow aloft from the east, main hazards through the afternoon will continue to be locally heavy, potentially flooding rainfall as high PWATs allow for highly efficient rain producing storms that could produce up to 2-4 inches in a few isolated locations as storms initially moving east will slowly drift back to the west as cloud top winds shift easterly this afternoon. High temperatures will be hotter over SE GA in the mid 90s where drier air and partly cloudy skies remain while the convection keeps temperatures a bit cooler over NE FL in the upper 80s to around 90 degrees closer to the I-10 corridor.
Tonight, storms should come to an end around sunset with debris clouds clearing out as drier air sinks into NE FL overnight. Some patchy fog is possible in areas that receive heavy rainfall. Lows tonight will be in the low to mid 70s inland and the upper 70s at the coast.
SHORT TERM [Friday Through Saturday Night].
Mid level ridging will expand it's ridge axis eastward from the central U.S. over the region. This will lead to rising height levels over the area with light southwest flow between surface high pressure ridging southeast of the region while a frontal boundary stays positioned NW of the area near the TN Valley. Drier air aloft will keep PWATs in the 1.4 to 1.7 inch range for most areas except for north central FL where PWATs will be in the 1.7 to 2.0 inch range. Therefore, coverage of showers and storms will be limited to isolated coverage over NE FL south of I-10 with scattered coverage mainly from Gainesville ESE to Palm Coast and points south over north central FL.
On Saturday, a weakening frontal boundary will sink southward into the area from the NW and bring an uptick in storm activity compared to Friday as the front, diurnal heating, and an increase in moisture aloft bump PWATs to around 1.7-1.9 inches combine to support scattered thunderstorms for most of the area.
Sunday, moisture levels will increase over the region as a mid to upper level trough forms over the eastern third of the nation and squashes mid level ridging south of the region into south FL to the Gulf of Mexico. Scattered to numerous thunderstorms will again return across the area with light west to southwest flow ahead of another frontal boundary sinking southward from the NW, but potential for stronger storms will be limited as mid level 500 mb temperatures will be only around -5 to -6 degrees Celsius and lapse rates generally below 6.0 C/km. Hotter temperatures will be above normal during the period with max Heat Index values reaching heat advisory criteria in the 108-112 range on Friday afternoon as high temperatures reach the mid to upper 90s over SE GA and areas over NE FL from the I-10 corridor northward with low 90s south of I-10. Saturday will be the hottest day this weekend with widespread mid to upper 90s over both NE FL and SE GA with max heat index values in the 110-114 degree range. High temperatures on Sunday will be not quite as hot with values in the mid 90s across the entire area and heat index values still in the 108-112 degree range.
Be sure to take precautions this weekend by limiting time outdoors, taking frequent breaks if taking part in outdoor activities, and staying hydrated. Overnight lows this weekend will be slow to cool down into the mid to upper 70s inland to near 80 degrees along the coast which will keep heat index values elevated in the 90s into the midnight hour with muggy, uncomfortable conditions through the evening time frame.
LONG TERM [Sunday Through Thursday].
Cooler temperatures and stormier conditions are expected through the period with broad mid/upper level troughing over the east coast of the U.S. Shortwaves will round the base of the trough while ridging aloft and at the surface remains southeast of the region. Light SW flow will keep a moist airmass in place with a cold front moving south into the area late Monday into Tuesday with numerous to widespread showers and thunderstorms expected. The front will increase shear levels over the area and could enhance strong to severe thunderstorm potential Monday and into Tuesday. Another cold front will stall north of the area over the Carolinas and GA on Wednesday and Thursday and with ample moisture, diurnal heating and seabreeze collisions expected to yield numerous to widespread showers and storms through midweek.
High temperatures during the period will return to seasonal values in the lower 90s on Monday and then below seasonal with highs in the upper 80s to around 90 degrees Tuesday through Thursday. Lows will be in the low to mid 70s next week.
High pressure will persist south of the local waters through the weekend offshore flow limiting seas to 2 to 3 feet. A cold front will approach the waters from the north early next week bringing an increase in winds and rain chances.
Rip Currents: Low risk for NE FL and SE GA beaches through Saturday.
The Santa Fe and St. Marys river basins continued in Minor Flood.
PRELIMINARY POINT TEMPS/POPS.
AMG 74 98 76 97 76 / 0 10 0 40 20 SSI 78 93 80 96 80 / 0 0 0 20 20 JAX 75 96 78 98 78 / 10 10 0 30 10 SGJ 75 93 77 95 77 / 10 10 0 20 10 GNV 74 93 75 93 76 / 20 30 10 30 10 OCF 74 91 75 93 76 / 20 40 10 30 10
JAX WATCHES/WARNINGS/ADVISORIES. FL . None. GA . None. AM . None.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|SAUF1 - St. Augustine, FL||1 mi||87 min||WSW 2.9 G 4.1||80°F||86°F||1016.5 hPa (+0.0)||75°F|
|41117||13 mi||57 min||82°F||84°F||2 ft|
|GTXF1 - Guana Tolomato Matanzas Reserve, FL||15 mi||102 min||WNW 1.9||79°F||1017 hPa||76°F|
|BKBF1||32 mi||57 min||82°F||1016.3 hPa|
|LTJF1||37 mi||57 min||84°F||73°F|
|MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL||38 mi||57 min||S 2.9 G 7||84°F||86°F||1016.6 hPa|
|BLIF1||39 mi||57 min||SSW 7 G 8.9||84°F||1016.1 hPa||79°F|
|DMSF1||39 mi||57 min||86°F|
|NFDF1||41 mi||57 min||S 5.1 G 6||83°F||1015.9 hPa||79°F|
Wind History for I-295 Bridge, St Johns River, FL(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Northeast Florida Regional Airport, FL||8 mi||31 min||W 3||10.00 mi||Fair||79°F||76°F||90%||1016.4 hPa|
Link to 5 minute data for KSGJ
Wind History from SGJ (wind in knots)
|1 day ago||S||SW||Calm||Calm||Calm||SW||SW||SW||W||SW||SW||SW||W||W||NW||NE||NE||E||SW||SW||W||W||Calm|
|2 days ago||Calm||Calm||Calm||S||S||S||SW||S||SW||SW||W||W||SW||W||NW||SE||SE||N|
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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